CN102119482A - Crest factor reduction with phase optimization - Google Patents
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Abstract
A system for reducing peaks comprises a processor and a memory. The processor is configured to determine a phase offset for each of a plurality of input signals. The phase offset for each of the plurality of input signals are determined using one or more trials of phase offsets to determine a selected set of phase offsets. The processor is further configured to modulate the plurality of input data signals using the selected set of phase offsets to produce a plurality of modulated phase offset data signals and to generate a sum of the plurality of modulated phase offset data signals, wherein the sum has a lower peak value during a trial of the one or more trials of phase offsets as compared to the sum during another trial not using the selected set of phase offset signals. The memory is coupled to the processor and configured to provide the processor with instructions.
Description
The cross reference of other applications
The application requires the U.S. Provisional Patent Application No.61131760(attorney OPTIP022+ that is entitled as CFR REDUCTION WITH PHASE OPTIMIZATION that submitted on June 11st, 2008) priority, by reference the document is herein incorporated for all purposes.
Background technology
Cellular telephone base stations utilizes the radiofrequency signal of one of many encoding schemes coding to communicate by letter with a plurality of cell phone clients by use.Some radio frequency encoding schemes (for example multicarrier GSM) are divided into a plurality of groups and use different transmit frequency to each group with described a plurality of clients.Some radio frequency encoding schemes (for example OFDM) use a plurality of carrier frequencies to be transmitted into each client concurrently.Summed with the different frequency modulated digital signal, convert analog signal to and send to power amplifier and reflector.When the signal on described a plurality of different carrier frequencies identical (for example during signal header, midamble (amble) or postamble), signal is (constructively) addition longways mutually when summed, thereby causes than the common much higher peak, peak that occurs between the signal transmission period.
Description of drawings
Each embodiment of the present invention is disclosed in the following the detailed description and the accompanying drawings.
Figure 1A is the block diagram that the embodiment of the wireless network that uses the crest factor with phase optimization to reduce (crest factor reduction) is shown.
Figure 1B is the block diagram that the embodiment of the cellular basestation that uses the crest factor reduction with phase optimization is shown.
Fig. 2 is the block diagram that the embodiment of data modulator and reflector is shown.
Fig. 3 is for illustrating the block diagram that optimum phase is offset the embodiment of determiner (determiner).
Fig. 4 A is the block diagram that the embodiment of the parallel data flow-generator with random phase offset is shown.
Fig. 4 B is the block diagram that the embodiment of the serial data flow-generator with random phase offset is shown.
Fig. 5 is the block diagram that the embodiment of minimum data stream peak value determiner and optimum phase offset memories is shown.
Fig. 6 is the flow chart that the embodiment of the process that is used for definite one group of optimum phase deviant is shown.
Fig. 7 is the flow chart that the embodiment that is used to use the crest factor with phase optimization to reduce to prepare one group of process that is used for data signals transmitted is shown.
Embodiment
The present invention can realize in many ways, comprises as process; Device; System; Material is formed; The computer program that on computer-readable recording medium, comprises; And/or processor, for example be configured to carry out processor in the instruction of being coupled to storage on the memory of this processor and/or providing by this memory.In this manual, any other form that can take of these implementations or the present invention can be called technology.Usually, within the scope of the invention, can change the order of the step of disclosed process.Except as otherwise noted, the parts such as processor or memory that are described as being configured to execute the task may be implemented as the general parts that temporarily are configured to carry out this task in preset time, perhaps are manufactured into the specific features of this task of execution.When using in this article, term " processor " refers to one or more equipment, the circuit of the data that are configured to handle such as computer program instructions and/or handles nuclear.
The detailed description of one or more embodiment of the present invention provides with the accompanying drawing that principle of the present invention is shown hereinafter.The present invention is described in conjunction with such embodiment, but the present invention is not limited to any embodiment.Scope of the present invention is only by the claim restriction, and the present invention comprises many replaceable schemes, modification and equivalent.Many specific details have been set forth in the following description so that provide for thorough of the present invention.These details provide for example purposes, and implement according to claim under the present invention can be in not having these specific detail the situation of some or all.For purpose clearly, do not describe technologic material known in the technical field relevant in detail, so that do not make the present invention unnecessarily fuzzy with the present invention.
Disclosing the crest factor with phase optimization reduces.The system that is used to reduce the peak comprises processor and memory.Processor is configured to determine each the phase deviation in a plurality of input signals, wherein one group of phase deviation selecting by each the phase deviation of using one or more phase deviations to test to determine in described a plurality of input signal so that determine.Processor further is configured to use this one group of selected phase deviation to modulate described a plurality of input data signal to produce the phase deviation data-signal of a plurality of modulation.Processor further be configured to generate described a plurality of modulation the phase deviation data-signal and, wherein should have with the duration of test in described one or more phase deviations tests with another duration of test that does not use described selected one group of phase-shift signal with compare lower peak value.
In certain embodiments, make the phase deviation of phase deviation the best of a plurality of carrier waves reduce the amplitude (magnitude) at the peak of when each carrier modulation common signal, creating widely.The optimum phase skew is irrelevant with modulated common signal, and only depends on the convergent-divergent and the frequency interval of described a plurality of carrier waves.
In certain embodiments, determine best phase deviation group by one group of random experiment.Repeat following process, select one group of phase deviation therein randomly; Use modulating frequency of wishing and the phase deviation of selecting at random to send test data by modulator; And measure the peak amplitude of summing signal.The number of times that this process is repeated to fix, and will produce the phase deviation group of the phase deviation group selection of minimum peak amplitude for the best.In certain embodiments, when receiving beginning with the order of one group of new carrier frequency transmission, the phase deviation group of the best is determined in the base station by the random experiment method.
Figure 1A is the block diagram that the embodiment of the wireless network that uses the crest factor reduction with phase optimization is shown.Shown in example in, cellular device 100, cellular device 102 and cellular device 104 are communicated by letter with cellular basestation 106.In different embodiment, cellular device 100, cellular device 102 and cellular device 104 use identical carrier frequency, use two different carrier frequencies or use three different carrier frequencies to communicate by letter with cellular basestation 106.In certain embodiments, cellular basestation 106 is communicated by letter with a plurality of unshowned additional cellular devices.In different embodiment, cellular basestation 106 is communicated by letter with the cellular device of 3 cellular devices, 15 cellular devices, 100 cellular devices or any other right quantity altogether.In different embodiment, cellular basestation 106 uses the different carrier frequencies of single carrier frequency, 4 different carrier frequencies, 25 different carrier frequencies or any other right quantity to communicate by letter with cellular device.In different embodiment, cellular basestation 106 uses multicarrier global system for mobile communications standard (GSM), uses OFDM (OFDM) or use to utilize any other suitable encoding scheme of a plurality of carrier waves to communicate by letter with cellular device.
Shown in example in, cellular basestation is also communicated by letter with cellular network 108.Cellular network 108 comprises connection, switching subsystem and any other the suitable network connection system between the base station.Cellular network 108 is communicated by letter with external voice/data network 110, thereby allows cellular device 100, cellular device 102 to communicate by letter with external voice/data network 110 with cellular device 104.
External voice/data network 110 comprises the voice telephony network that is used to connect various voice call equipment.In different embodiment, external voice data network 110 comprises PSTN, dedicated voice telephone network or any other suitable voice telephony network.By making cellular device 100 can be connected to voice/data network 110, the user of cellular device 100 can with another user of the equipment that directly or indirectly is connected to voice/data network 110 (for example cell phone (cell phone) user, telephone user, Internet Protocol telephone user--for example internet voice protocol user) oral conversation.For example, the user can use cellular device 100 to phone the someone.
In different embodiment, cellular network 108 is connected to or is free of attachment to one or more data networks (for example external voice/data network 110).Cellular device can use and visit itself and being connected of cellular network 108 data network (for example the Internet, Email, photo are shared or the like).In certain embodiments, cellular device comprises data equipment.In certain embodiments, this data equipment is connected to outer data network, and is free of attachment to the external voice network.
Figure 1B is the block diagram that the embodiment of the cellular basestation that uses the crest factor reduction with phase optimization is shown.In certain embodiments, the cellular basestation of Figure 1B is the cellular basestation 106 of Figure 1A.Shown in example in, the cellular basestation of Figure 1B comprises data processor 150, modulating frequency determiner 152, optimum phase skew determiner 154 and data modulator and reflector 156.Data processor 150 receives the data from cellular network (for example cellular network 108 of Figure 1A), prepares the data that are used to transmit, and these data are sent to data modulator and reflector 156.In certain embodiments, preparing to be used for data packets for transmission draws together determine that given data block should transmit on which of one or more transmission channels.Modulating frequency determiner 152 receives from each frequency that should modulate in the order of cellular network and the definite described one or more transmission channels.In different embodiment, determine modulating frequency based on the data that receive from cellular network individually, determine modulating frequency based on the internal state of modulating frequency determiner 152 individually, perhaps determine modulating frequency based on the data that receive and any suitable combination of internal state.The modulating frequency determiner sends to data modulator and reflector 156 with the modulating frequency of determining and sends to optimum phase skew determiner 154.In certain embodiments, modulating frequency determiner 152 is also determined the convergent-divergent amplitude related with each modulating frequency and convergent-divergent amplitude group is sent to optimum phase skew determiner 154 and data modulator and reflector 154.Optimum phase skew determiner 154 is based on the definite optimum phase offset bank for data modulator and reflector 156 uses of the modulating frequency that receives from modulating frequency determiner 152.In certain embodiments, optimum phase skew determiner 154 is by at finding the phase deviation group that produces possible minimum peak to determine the optimum phase offset bank with the modulating frequency modulation that receives and with one group of test signal of phase deviation group skew.In certain embodiments, this group test signal for each channel all be constant signal (for example keep steady state value signal, stablize sinusoidal signal, keep signal of repeat pattern or the like).In certain embodiments, by using one group of phase deviation determining at random to carry out one group of test for each test and determining that for this group test the phase deviation group that produces minimum peak finds described optimum phase offset bank.Data modulator and reflector 156, are carried out the further processing of any necessity and these data are sent to transmitting antenna from the data that data processor 150 receives with the frequency modulation(FM) of the phase deviation that receives from modulating frequency determiner 152, skew is received by optimum phase skew determiner 154.
In certain embodiments, one or more processors are for example determined one group of selected phase deviation of optimum phase skew determiner 154() and data modulator and reflector 156(for example use one group of phase deviation modulating input data signal, these signals of convergent-divergent and to these signals summations) carry out data-signal and handle.
Fig. 2 is the block diagram that the embodiment of data modulator and reflector is shown.In certain embodiments, this data modulator and reflector are realized data modulator and the reflector 156 of Figure 1B.In certain embodiments, this data modulator and reflector are a part of using the cellular basestation of the crest factor reduction with phase optimization.Shown in example in, data 1 200 comprise will be with first data flow of first carrier frequency f c1 modulation.The phase deviation optimum phase skew of carrier wave
Digital controlled oscillator 204 comprises the digital oscillator that can vibrate with the phase deviation of hope under the frequency of hope.Digital controlled oscillator 204 is at frequency f c1 place and with phase place
Vibration.Multiplier 202 with data 1 200 with multiply each other from the vibration of digital controlled oscillator 204, with first carrier frequency modulation(FM) first data flow.In certain embodiments, first data flow of this modulation is then with the first amplitude convergent-divergent.
Fig. 3 is the block diagram that the embodiment of optimum phase skew determiner is shown.In certain embodiments, the optimum phase of Fig. 3 skew determiner is realized the optimum phase skew determiner 154 of Figure 1B.Shown in example in, be used for determining that the system of the phase deviation of one group of the best comprises data stream generator 300 and minimum data stream peak value determiner and the optimum phase offset memories 302 with random phase offset.Data stream generator 300 with random phase offset comprise be used to generate with the data channel of different frequency modulation related a group at random phase deviation and be used to generate the hardware of test data stream.Before operation, the frequency that is used for modulation channel is received by the data stream generator 300 with random phase offset.Test data stream represent one group of channel and, each channel usage modulating oscillator is modulated predetermined test data stream, the phase deviation that each modulating oscillator skew is suitably definite at random.Minimum data stream peak value determiner and optimum phase offset memories 302 comprise the peak value that is used for determining the data flow that generated by the data stream generator 300 with random phase offset, in the phase deviation that many groups are determined at random specified data stream peak minimum value and be used to store hardware with the optimum phase offset bank of data stream association with smallest peaks.
In different embodiment, pre-determine, pseudorandom is determined or determine phase deviation by any other suitable method.In different embodiment, be used for determining that the test signal of peak summing signal comprises: sine wave, square wave, constant signal, random signal, structuring signal or any other suitable test signal.
In certain embodiments, for the input traffic of modulation carries out and the processor determined comprises the hardware group or the processing of minimizing, it is handled test signal serially and these signals is suitably made up so that save hard-wired optimum phase and is offset space on the determiner.
Fig. 4 A is the block diagram that the embodiment of the parallel data flow-generator with random phase offset is shown.In certain embodiments, the parallel data flow-generator with random phase offset of Fig. 4 A is realized the data stream generator with random phase offset 300 of Fig. 3, and it calculates modulation channel concurrently.Shown in example in, digital controlled oscillator 400 receives the first modulating frequency fc1 and first phase deviations
And according to these parameter generating vibrations.Vibration from digital controlled oscillator 400 is sent to look-up table 402.Look-up table 402 is created the real part and the imaginary part of the complex values test signal at the frequency place that is driven by digital controlled oscillator 400.In certain embodiments, look-up table 402 generates the sine and the cosine of input value.In certain embodiments, the amplitude of the signal that generates of look-up table 402 by multiplier 404 with the first amplitude S1 convergent-divergent.In certain embodiments, the convergent-divergent amplitude receives from modulating frequency determiner (for example modulating frequency determiner 152 of Figure 1B) with first modulating frequency.Digital controlled oscillator 406, look-up table 408 and multiplier 410 comprise the copy of digital controlled oscillator 400, look-up table 402 and multiplier 404, are used to use the second modulating frequency fc2, second phase deviation
Create second modulated test signal with the second convergent-divergent amplitude S2.Digital controlled oscillator 416, look-up table 418 and multiplier 420 comprise the copy of digital controlled oscillator 400, look-up table 402 and multiplier 404, are used to use n modulating frequency fcN, n phase deviation
SN creates the n modulated test signal with n convergent-divergent amplitude.In certain embodiments, there is the copy that generates (generating) hardware with the as many test signal of the transmission channel that in data modulator and reflector (for example data modulator of Fig. 2 and reflector), exists.In different embodiment, determine and the corresponding optimum phase skew of all N modulation channel, determine and N-2 the corresponding optimum phase skew of modulation channel, determine and N/2 corresponding optimum phase skew, perhaps determine and the corresponding optimum phase skew of any other suitable subclass of described modulation channel.
Shown in example in, adder 412 will be from the real part of the signal of multiplier 404 output with from the real part addition of the signal of multiplier 410 outputs.The real part of the signal that each channel that is generated hardware by test signal is generated is sued for peace, will be from the real part of signal and the finishing with addition of adding up to previously of multiplier 420 outputs with adder 422.Adder 414 will be from the plural portion (complex part) of the signal of multiplier 404 output with from the plural portion addition of the signal of multiplier 410 outputs.The plural portion of the signal that each channel that is generated hardware by test signal is generated sues for peace, will be from the plural portion of signal and the finishing with addition of adding up to previously of multiplier 420 outputs with adder 424.That add up to by the 426 pairs of real numbers of squarer and carry out square, and add up to by 428 pairs of plural numbers of squarer and carry out square, and then by adder 430 to this two processes square and sue for peace.430 output be the summation modulated test signal complex amplitude square.In certain embodiments, squarer is replaced by the complex amplitude operation.
Sample Counter 432 and test counter 434 are followed the tracks of the progress of optimum phase skew deterministic process.The sample number that calculates in 432 pairs of current tests of Sample Counter is counted, and this counting is communicated to test counter 434.In different embodiment, the sample of each 10,100,1000 of test calculating or any other right quantity.When reaching the sample limit, Sample Counter resets and tests counter and sends new stimulus and increase its counting.434 pairs of test number (TN)s that occur in current optimum phase skew deterministic process of test counter are counted and this counting are sent to random phase generator 436.In different embodiment, the test of each optimum phase skew deterministic process execution 10 times, 100 times, 1000 times or any other suitable number of times.When receiving when beginning to optimize signal each its counting that resets in Sample Counter 432 and the test counter 434.When random phase generator 436 received the order of new test, this random phase generator generated one group of new phase deviation randomly
,
,
For test.In certain embodiments, random phase generator 436 uses linear feedback shift register to generate random phase.These phase deviations send to digital controlled oscillator and minimum data stream peak value determiner and optimum phase offset memories (for example minimum data of Fig. 3 stream peak value determiner and optimum phase offset memories 302).
Fig. 4 B is the block diagram that the embodiment of the serial data flow-generator with random phase offset is shown.In certain embodiments, the serial data flow-generator with random phase offset of Fig. 4 B is realized the data stream generator with random phase offset 300 of Fig. 3, and it calculates modulation channel serially.Shown in example in, digital controlled oscillator 450 receives the first modulating frequency fc1 and first phase deviations
And according to these parameter generating vibrations.Vibration from digital controlled oscillator 450 sends to look-up table 452.Look-up table 452 is created the real part and the imaginary part of the complex values test signal at the frequency place that is driven by digital controlled oscillator 450.In certain embodiments, look-up table 452 generates the sine and the cosine of input value.In certain embodiments, the amplitude of the signal that generates of look-up table 452 by multiplier 454 according to the first amplitude S1 convergent-divergent.In certain embodiments, the convergent-divergent amplitude receives from modulating frequency determiner (for example modulating frequency determiner 152 of Figure 1B) with first modulating frequency.Multiplexer 456 is stored from the modulating frequency value of modulating frequency determiner reception and will be sent to digital controlled oscillator 450 with the corresponding modulating frequency value of suitable modulator quantity.This suitable modulator quantity is indicated to multiplexer 456 by the value M of modulator counter 478.Multiplexer 458 is stored from the convergent-divergent range value of modulating frequency determiner reception and will be sent to multiplier 454 with the corresponding convergent-divergent range value of suitable modulator quantity.This suitable modulator quantity is indicated to multiplexer 458 by the value M of modulator counter 478.Multiplexer 460 is stored the phase pushing figure that is generated by random phase generator 482 and will be sent to digital controlled oscillator 450 with suitable modulator quantity respective phase deviant.This suitable modulator quantity is indicated to multiplexer 460 by the value M of modulator counter 478.In different embodiment, determine and the corresponding optimum phase skew of all N modulation channel, determine and N-2 the corresponding optimum phase skew of modulation channel, determine and N/2 corresponding optimum phase skew, perhaps determine and the corresponding optimum phase skew of any other suitable subclass of described modulation channel.
Shown in example in, accumulator 462 is kept from the aggregate value of the real part of the signal of multiplier 454 output.When the new modulator of indication,, and in summer 466, the value of storage in the real part of output and the accumulator 462 is sued for peace from the new value of multiplier 454 outputs.Then, should and be stored in the accumulator 462.Accumulator 464 is kept from the aggregate value of the plural portion of the signal of multiplier 454 outputs.When the new modulator of indication, from the new value of multiplier 454 outputs, and should plural number portion in summer 468 with accumulator 464 in the value of storage sue for peace.Then, should and be stored in the accumulator 464.That the 470 pairs of real numbers of squarer add up to and carry out square, that 472 pairs of plural numbers of squarer add up to and carry out square, and then by adder 474 to this two squares and sue for peace.474 output be the summation modulated test signal complex amplitude square.In certain embodiments, squarer is replaced by the complex amplitude operation.
In certain embodiments, use the combination (for example combination of the hardware as shown in Fig. 4 A and Fig. 4 B) of parallel and serial data flow-generator.
Fig. 5 is the block diagram that the embodiment of minimum data stream peak value determiner and optimum phase offset memories is shown.In certain embodiments, the minimum data of Fig. 5 stream peak value determiner and optimum phase offset memories realize minimum data stream peak value determiner and the optimum phase offset memories 302 of Fig. 3.Shown in example in, minimum data stream peak value determiner and optimum phase offset memories comprise peak detector 500, minimum value tracker 502 and phase deviation memory 504.Peak detector 500 is found out from the peak value of the amplitude data flow of the data stream generator with random phase offset (for example data stream generator with random phase offset 300 of Fig. 3) reception.When peak detector 500 received new stimulus from the data stream generator with random phase offset, peak detector 500 outputed to minimum value tracker 502 with the peak value of storage and the peak value of storage is resetted.Minimum value tracker 502 is followed the tracks of the minimum peak that receives from peak detector 500.If the peak value that receives is less than the minimum peak of storage in the minimum value tracker 502, minimum value tracker 502 is stored the peak value of these receptions and has been found new minimum peak to 504 indications of phase deviation memory so.When minimum value tracker 502 receives when beginning to optimize signal, remove the peak value of storage in the minimum value tracker 502.When new on-test, phase deviation memory 504 receives the current phase deviation group that random phase generators (for example random phase generator 482 of the random phase generator 436 of Fig. 4 A or Fig. 4 B) generate.When phase deviation memory 504 receives the new minimum peak signal that finds from minimum value tracker 502, the phase pushing figure group that 504 storages of phase deviation memory receive recently
,
,
, and this phase pushing figure group is output as the optimum phase deviant
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,
Fig. 6 is the flow chart that the embodiment of the process that is used for definite one group of optimum phase deviant is shown.In certain embodiments, the process of Fig. 6 is carried out so that determine one group of optimum phase deviant by the optimum phase skew determiner 154 of Figure 1B.Shown in example in, at 600 places, reception carrier frequency and amplitude.At 602 places, create the random phase offset that is used for each carrier wave.In certain embodiments, create random phase offset in the subclass of the carrier wave of entire quantity each.In certain embodiments, before creating random phase offset, utilize new seed (seed) initialization random generator.At 604 places, each random phase offset is sent to the digital controlled oscillator related with its carrier wave.At 606 places, it is sinusoidal wave to generate plural number for each carrier wave.In certain embodiments, it is sinusoidal wave to utilize look-up table to generate plural number.At 610 places, plural sine wave is made up at the sample that pre-determines quantity.In different embodiment, plural sine wave is made up at the sample of 10 samples, 100 samples, 1000 samples or any other right quantity.At 612 places, pre-determining the sinusoidal wave peak amplitude of plural number of finding out combination on the sample of quantity.In certain embodiments, find out the sinusoidal wave peak amplitude of the plural number of combination square.At 614 places, the minimum peak of this peak amplitude and storage is compared.If find the minimum peak of this peak amplitude less than storage, control forwards 616 to so.At 616 places, this peak amplitude is stored as new minimum peak, and phase deviation is stored as new optimum phase skew, and control forwards 618 to.If do not determine the minimum peak of this peak amplitude less than storage at 618 places, control directly forwards 618 to so.At 618 places, the checkout facility counting understands whether reached maximum test value.In certain embodiments, beginning to be used for to determine to determine maximum test value before the process of one group of optimum phase deviant.In certain embodiments, determine maximum test value by algorithm based on the peak value that calculates.In certain embodiments, when finding the peak summing signal that is lower than predetermined value, regulate maximum test value so that allow to finish this process.In different embodiment, maximum test value is the test of 10 tests, 100 tests, 1000 tests or any other suitable number of times.If the confirmed test counting does not reach maximum test value, control forwards 602 to so, creates one group of new random phase and repeats described process at this.If the confirmed test counting reaches maximum test value, so described process finishes.
In certain embodiments, skew reaches predetermined threshold value and finishes described process based on smallest peaks.
Fig. 7 illustrates to be used to use the crest factor with phase optimization reduce to prepare the flow chart of the embodiment of one group of process that is used for data signals transmitted.In certain embodiments, the process of Fig. 7 is used by the cellular basestation (for example cellular basestation 106 of Fig. 1) that utilization has the crest factor reduction of phase optimization.Shown in example in, at 700 places, determine phase deviation in a plurality of input data signals each.By using one or more phase deviations to test to determine each the phase deviation in described a plurality of input signal, so that determine one group of selected phase deviation.In certain embodiments, determine phase deviation by the process of using Fig. 6.At 702 places, use described one group of selected phase deviation to modulate described a plurality of input data signal so that produce the phase deviation data-signal of a plurality of modulation.At 704 places, generate described a plurality of modulation the phase deviation data-signal and.Should have with duration of test in described one or more phase deviations test with another duration of test that does not use described selected one group of phase-shift signal and compare lower peak value, and described process end.
Although slightly described the embodiment of front in detail for the purpose that is expressly understood, the details that provided is provided in the present invention.There are the many interchangeable modes of the present invention of implementing.The disclosed embodiments are illustrative, rather than restrictive.
Claims (20)
1. system that is used to reduce the peak comprises:
Processor, it is configured to:
Determine each the phase deviation in a plurality of input signals, wherein by using one or more phase deviations to test to determine each the phase deviation in described a plurality of input signal, so that determine one group of selected phase deviation; And
Use described one group of selected phase deviation to modulate described a plurality of input data signal to produce the phase deviation data-signal of a plurality of modulation; And
Generate described a plurality of modulation the phase deviation data-signal and, wherein should have with the duration of test in described one or more phase deviations test with another duration of test that does not use described selected one group of phase-shift signal with compare lower peak value; And
Memory, it is coupled to processor and is configured to provides instruction to processor.
2. the system as claimed in claim 1 is wherein selected each phase deviation in described a plurality of input signal randomly for each test in described one or more tests.
3. the system as claimed in claim 1, the test that wherein pre-determines number of times is used to determine described one group of selected phase deviation.
4. the system as claimed in claim 1 wherein determines that by algorithm the test of number of times is used to determine described one group of selected phase deviation.
5. the system as claimed in claim 1 is wherein by finding the one group of phase deviation that produces ebb summing signal in response to Test input signal to select described one group of selected phase deviation.
6. the system as claimed in claim 1 is wherein selected described one group of selected phase deviation by one group of phase deviation finding generation to be lower than the peak summing signal of predetermined value.
7. the system as claimed in claim 1, wherein receive frequency variable signal before modulating frequency changes.
8. system as claimed in claim 6 is wherein receiving definite described one group of selected phase deviation under the situation of frequency variation signal.
9. the system as claimed in claim 1 wherein received the convergent-divergent variable signal before modulating frequency changes.
10. the system as claimed in claim 1, wherein data processor further be configured to generate described and before the phase deviation data-signal of the described a plurality of modulation of convergent-divergent.
11. a method that is used to reduce the peak comprises:
Determine each the phase deviation in a plurality of input signals, wherein by using one or more phase deviations to test to determine each the phase deviation in described a plurality of input signal, so that determine one group of selected phase deviation;
Use described one group of selected phase deviation to modulate described a plurality of input data signal to produce the phase deviation data-signal of a plurality of modulation; And
Generate described a plurality of modulation the phase deviation data-signal and, wherein should have with the duration of test in described one or more phase deviations test with another duration of test that does not use described selected one group of phase-shift signal with compare lower peak value.
12. method as claimed in claim 11 is wherein selected each phase deviation in described a plurality of input signal randomly for each test in described one or more tests.
13. method as claimed in claim 11, the test that wherein pre-determines number of times is used to determine described one group of selected phase deviation.
14. method as claimed in claim 11 wherein determines that by algorithm the test of number of times is used to determine described one group of selected phase deviation.
15. method as claimed in claim 11 is wherein by finding the one group of phase deviation that produces ebb summing signal in response to Test input signal to select described one group of selected phase deviation.
16. method as claimed in claim 11 is wherein by finding the one group of phase deviation that produces the peak summing signal that is lower than predetermined value to select described one group of selected phase deviation.
17. method as claimed in claim 11, wherein receive frequency variable signal before modulating frequency changes.
18. method as claimed in claim 17 is wherein receiving definite described one group of selected phase deviation under the situation of frequency variation signal.
19. method as claimed in claim 11 wherein received the convergent-divergent variable signal before modulating frequency changes.
20. method as claimed in claim 11 further is included in the phase deviation data-signal that generates described and the described a plurality of modulation of convergent-divergent before.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US13176008P | 2008-06-11 | 2008-06-11 | |
| US61/131760 | 2008-06-11 | ||
| PCT/US2009/003470 WO2009151579A1 (en) | 2008-06-11 | 2009-06-09 | Crest factor reduction with phase optimization |
Publications (1)
| Publication Number | Publication Date |
|---|---|
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| US8369809B2 (en) | 2007-07-27 | 2013-02-05 | Netlogic Microsystems, Inc. | Crest factor reduction |
| US8509345B2 (en) | 2008-06-11 | 2013-08-13 | Netlogic Microsystems, Inc. | Crest factor reduction with phase optimization |
| EP2513897B1 (en) * | 2009-12-16 | 2014-08-20 | Robert Bosch GmbH | Audio system, method for generating an audio signal and corresponding computer program |
| EP2745484A4 (en) * | 2012-01-12 | 2015-07-15 | Ericsson Telefon Ab L M | Adaptive phase shift apparatus and method |
| US8687733B1 (en) * | 2012-04-18 | 2014-04-01 | Altera Corporation | Digital predistortion (DPD) method and system for selecting at least one data sample |
| US9001928B2 (en) * | 2013-03-28 | 2015-04-07 | Texas Instruments Incorporated | Transmitter first/second digital predistortion and first/second adaption circuitry with feedback |
| CN103312655B (en) * | 2013-05-28 | 2016-08-10 | 京信通信技术(广州)有限公司 | A kind of multicarrier phase optimization method and device |
| KR20160048160A (en) | 2013-08-29 | 2016-05-03 | 후아웨이 테크놀러지 컴퍼니 리미티드 | Method and node in a wireless communication network |
| US11032112B2 (en) * | 2019-10-18 | 2021-06-08 | Motorola Solutions, Inc. | Multi-carrier crest factor reduction |
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| US5838732A (en) * | 1994-10-31 | 1998-11-17 | Airnet Communications Corp. | Reducing peak-to-average variance of a composite transmitted signal generated by a digital combiner via carrier phase offset |
| DE19635813A1 (en) * | 1996-09-04 | 1998-03-05 | Johannes Prof Dr Ing Huber | Process for reducing the peak value factor in digital transmission processes |
| US7280607B2 (en) * | 1997-12-12 | 2007-10-09 | Freescale Semiconductor, Inc. | Ultra wide bandwidth communications method and system |
| US7430257B1 (en) * | 1998-02-12 | 2008-09-30 | Lot 41 Acquisition Foundation, Llc | Multicarrier sub-layer for direct sequence channel and multiple-access coding |
| US7406261B2 (en) * | 1999-11-02 | 2008-07-29 | Lot 41 Acquisition Foundation, Llc | Unified multi-carrier framework for multiple-access technologies |
| US7190292B2 (en) * | 1999-11-29 | 2007-03-13 | Bizjak Karl M | Input level adjust system and method |
| AU2001278971A1 (en) * | 2000-07-21 | 2002-02-05 | Pmc-Sierra, Ltd. | Systems and methods for reduction of peak to average signal levels of multi-bearer single-carrier and multi-carrier waveforms |
| DE10302113B4 (en) * | 2003-01-21 | 2017-12-28 | Lantiq Deutschland Gmbh | Method and device for reducing the crest factor of a signal |
| GB0327041D0 (en) * | 2003-11-21 | 2003-12-24 | Roke Manor Research | Apparatus and methods |
| US7391713B2 (en) * | 2003-12-30 | 2008-06-24 | Kiomars Anvari | Phase rotation technique to reduce Crest Factor of multi-carrier signals |
| DE102004032667B4 (en) * | 2004-07-06 | 2009-12-03 | Infineon Technologies Ag | Device for reducing the dynamic range of signals in transmitters of communication systems |
| KR100715913B1 (en) * | 2004-10-12 | 2007-05-08 | 삼성전자주식회사 | Apparatus and Method for Searching Signaling Signaling in Orthogonal Frequency Division Multiple Access Mobile Communication System |
| US7634024B2 (en) * | 2005-01-31 | 2009-12-15 | Agere Systems Inc. | Adaptive peak windowing for crest factor reduction in a communication system transmitter |
| US20080049864A1 (en) * | 2006-08-28 | 2008-02-28 | Eriksson Stefan G | Method and apparatus for spectrum-preserving amplitude compression of a modulated signal |
| US8050352B2 (en) * | 2007-03-14 | 2011-11-01 | Panasonic Corporation | Methods and apparatus for reducing peak-to-RMS amplitude ratio in communication signals |
| TW200844886A (en) * | 2007-05-09 | 2008-11-16 | Chih-Chen Wu | A digital customer service method and a system thereof |
| US8369809B2 (en) * | 2007-07-27 | 2013-02-05 | Netlogic Microsystems, Inc. | Crest factor reduction |
| US8509345B2 (en) | 2008-06-11 | 2013-08-13 | Netlogic Microsystems, Inc. | Crest factor reduction with phase optimization |
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| EP2304870A4 (en) | 2017-03-29 |
| EP2304870A1 (en) | 2011-04-06 |
| WO2009151579A1 (en) | 2009-12-17 |
| US8509345B2 (en) | 2013-08-13 |
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